Speed:
* Swift: Emphasizes quickness and agility.
* Rapid: Similar to swift, but can imply a more forceful movement.
* Quick: More general term for speed.
* Expeditious: Efficient and prompt.
* Brisk: Lively and energetic movement.
* Hasty: Often implies a rushed or careless speed.
* Accelerated: Increased speed over time.
* Fleet: Moving very quickly and effortlessly.
Other meanings:
* Abstinent: Refusing food or drink, often for religious reasons.
* Firm: Strongly attached or held.
* Stuck: Unable to move or progress.
* Secure: Tightly fastened or locked.
* Close: Near in time, space, or relationship.
Please provide more context so I can give you the most relevant synonym for "fast". For example, are you talking about speed, a religious practice, or something else entirely?